Miner&#39;s fuse-cap.



C. F. SPERY.

MINERS FUSE GAP.

APPLICATION FILED DBG. a, 1909.

Patented Apr. 12, 1910.

www @my 3f Ww "impervious to water.

CHARLES F. SPERY, 0F CHICAGO, ILLINCIS.-

MrNEas rusa-car.

.Specication of Letters Patent. Patented App', 12, 191),

Application, led- December 3, 1909. Serial No. 531,225.

To all whom it may concern.:

Be it known that I, CHARLES F. SPERY, a. citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements'in Miners Fuse-Caps, ofwhich the following is a description, reference being had to theaccompanying drawings, formingn a part ofthis specification, in whichcorresponding characters of reference in the different figures indicatelike parts.

The object of my-invention is to' provide a simple, cheap and eifectivewaterproof fusecap, such as is ordinarily employed by miners and othersfor igniting explosive charges in mines Lor quarries,-all of which ishere# inafter more particularly described and defi? nitely pointed outin the claims.

In'the drawings, Figure 1 is an elevation of a fuse-cap embodying thefeatures of my invention, as it would appear when attached to a fuse;Fig. 2 is a central vertical sectional view thereof; Fig. 3 is atransverse sectional view in plan taken upon the line 3 3, Fig. 1, andFigs. 4, 5, 6 and 7 are central longitudinal sectional views showingmodications of said invention.

Referring to the drawings, 1, indicates the main body of a shell orcasing, preferably formed from-copper or other metal or metallic alloy,said casing being closed at one end and open at the other.` An explosivematerial 2 is intended to be placed within the receptacle to be ignitedb means of the usual fuse 3, the end of w ich is arranged to cont-acttherewith.

The body of the casing is enlarged near its open end asshown at 4thereby forming an inclined portion 5, which results in an internalshoulder adapted. to form a seat for a packing ring 6 of rubber or othersuitable elastic packing material of a nature which is Extending fromthe outer end'of the enlarged portion toward the packing seatarescrew-threads 7 which, by-

preference, surround only a port-ion of the circumference of the shell,as clearly shown in Figs. 1 and 3, leaving portions 8 without threads,of the Vfull diameter of the enlarged cylindrical portion below. Thisconstructionuenables the threads to be formed without injuriousdistortion of the metal, while permitting the packing to be more readilyinserted.

An annular nut, generally designated 'by 9, is provided with ascrew-threaded portlon 10 adapted to enter the annular `space around thefuse andl force the packing 6 against the shoulder. An enlarged. portion11, having a knurled periphery, is formed.4

upon the nut to enable it to be adjusted. When the nut is screwed firmlyinto place the packing 6 iscaused to expand laterally thereby forming awater-tight joint around the` fuse. the nut which enters the shellshould be long enough to enable the, packing to be thoroughly compressedwithout causing the shoulder of theenlarged portion to abut against theend of the casing.

In Fig. 4 I have shown a modified con-v struction in which the threadedportionl 10 extends-to thepacking shoulder and is circumferential]continuous..

In Fig. 5 t e entire casing is of uniform diameter and the packing seatis formed by means of a peripheral groove 13. In Fig. 6 astill furthermodification is shown,1n which the shell or container is made in twoparts 14 and 15 respectively. The part 14, which is the explosivecontainer, is ared outwardly at the top as shown at 16, while theenlarged part 15 is.

made with an inwardly tapered ortion 17 adapted to it over the part 16,'wliich latter forms a packing seat.

In Fig. 7 I have shown a modification in which the nut 18 is providedwith 'an interior. thread,- an interior annular shoulder 19, while theupper end 20 of the container is constructed to form a seat'21 for thepacking ring 6.

I-Iavlng t us described my invention, I claim: e,

1. A fuse-cap in which is combined a shell for receiving an ignitioncharge, said shell being o en at one end forthe insertion of 'a fuse anprovided with an internal annular shoulder near said open end, anannular nut arran ed to t within Asaid ca and an annular e asticpacking' interpose between said nut and shoulder to form a water-tightjoint between the shell and a fuse when compressed by the nut. A

2. A fuse-cap comprising a receptacle adapted to hold an explosivecharge, said receptacle having an o enin therein for the insertion of afuse, a s oul er in said opening to form a seat for an annular elasticaekin a screw-threaded portion extendin rom t e outer end of the openingtowar said seat, and an annular nut having a por- It'is obvious that theportion of tion adapted to enter said opening to'cominternalpacking-chamber with a seat for packing, a portion between the end andsaid seat having threaded' sections formed in parts only of .thecircumference, and an annular nut adapted to enter` said open end, saidnutbeing' provided with suitable threads for engaginof said sections.

4. A device of tle class described, in which is combined a receptaclefor holding an explosivecharge, said receptacle beingl onen at one endfor the insertion of a fuse,

a shoulder withnsad opening to form a' packing seat, an annular elast-icpacking, a use inserted `within said opening, the same being surroundedwith said packing, and an annular nut having a portion exten ed with- 1nsaid opening to compress saidpacking against -said'fuse.

In testimony whereof, Ifhave signed f lspecification in thepresenceoftwo subscribrst day of December Witnesses:

D. H. FLETCHER, CARRIE E. JORDAN.

CHARLES F. SPERY,y

